mexico matmatters. it's the most important country along with canada on the face of the earth. >> gang violence claumed the lives of 15,000 people last year alone. it's estimatedt 1200ó[ñiw3ñiw3 president felipe calderon declared war on organized crime in 2006, some 40,000 people have been killed in the cross-fire of gangs fighting for lucrative drug routes into the united states. >> this is not just a drug fight. this is a struggle for the future of mexico. >> reporter: but with so much rampant killing, many question the mexican government's ability to successfully win its war on drugs. kevin tibbles, nbc news, new york. back now on this side of the border, for all their glamour, the duke and duchess of cambridge, william and kate, spent part of this day in one of the less glamorous parts of los angeles as they wrapped up their visit to north america. nbc's kate snow is there for us tonight. kate, good evening. >> reporter: good evening, lester. it is just about over now. the duke and duchess just arriving at l.a.x.